I feel confused, though. She knows that I want a girlfriend and the common expectation that men who still live with their parents tend to be dealbreakers for women.
X=your therapist
example is from your thought prospective
X is my therapist.
X wants what is best for me as my therapist.
getting a girlfriend is whats best for me.
therefore, X should focus most of her attention on helping me with that objective first and foremost with other life goals being of secondary importance.
the confusion in your mind is thus
moving out will help me get a girlfriend
X will agree with this because it will help me reach my primary life goal
X does not agree with me
i am confused, it as if X does not want to help me reach my primary goal
She does want to help you reach your goals. Its just that you and her are probably not on the same page when it comes to what your primary life goal should be. It is true that moving out and having your own place
may increase you chancing of acquiring a girlfriend. However, it would probably be at serious detriment to several other important aspects of your life. Moving out and becoming self sufficient shouldn't be taken lightly.
There would be many things that you would have to handle yourself (for the first time in your life) and it would put a huge burden on your psyche if you are suffering, stressed out and have other problems.
I don't know much about your situation, but it sounds like (from some of your other posts) you are in pain and struggle with other things in life. Your therapist probably believes these "other things" are of higher importance and i agree with her. I am in a similar situation as you except a little bit younger and without a job. I have never had a girlfriend in my life and the isolation that i experience everyday hurts me greatly. But focusing on those things will not help you get better. I know because iv fallen into this trap, one of my friends has too. Iv seen him almost drink himself to death over it. In my opinion there isn't a quick and easy way to numb this pain and focusing on it will simply make it worse for the time being.
So instead you should shift you attention to other things for now. Some examples that come to mind might be...
exercise
making friends
career advancement
exploring other aspects of life
improving social skills
implementing things learned in therapy etc...
if you continue to focus on the pain of being alone (not having a girlfriend etc) it
will destroy your mind. You must heed the friendly words of your therapist and start making other things a higher priority. Plus If you focus on improving your life in
a general sense (and not obsess on doing what you think is best to get a girlfriend) it will significantly improve your chances of actually getting a girlfriend. Ultimately, life improvement needs to come first.